Some issues regarding the use of pyvumat in Windows systems

[imyxc]

Your work is very commendable, but there are too many errors when running Abaqus using Windows system. Can you provide some simple examples for Windows system?

[jccrone]

Thank you for your interest in the code and I apologize for the delay in responding. I was trying to get access to Abaqus on a Windows machine, but I do not use Windows regularly, nor do I have access to one that has Abaqus on it. Could you provide an example of the errors you are receiving, perhaps they are not specific to Windows. Feel free to reach out via email, response times should be quicker.

[imyxc]

Thank you very much for your reply. I will try to use Linux to configure the project in the future. If there are similar problems, I hope to obtain some answers from you.

[imyxc]

I found that I couldn't find your contact information in the project. Can you provide an email so that I can contact you quickly?
Similarly, if possible, could you provide a specific Abaqus execution case to give us some guidance? Thank you very much for your reply, it will be of great help to us.

[jccrone]

It is harder to find within the user's guide than I thought. Please email me at joshua.crone.civ@army.mil and we can coordinate the best way to provide an example for Abaqus. Thanks.

[imyxc]

I tried to compile it using the abaqus2024windows version, but I found that it still reported an error, which prompted me: End Compiling Single Precision Abaqus/Explicit User Subroutines
Begin Linking Single Precision Abaqus/Explicit User Subroutines
Creating library explict9.lib and object explict9.exp
Msvcrt.lib (utility. obj): error LNK2019: Unresolvable external symbol __vcrt_initialize, referenced in function __scrt_initializes _crt
Msvcrt.lib (utility. obj): error LNK2019: Unresolvable external symbol __vcrt_uninitialize, referenced in function __scrt_initialize
Msvcrt. lib (utility. obj): error LNK2019: Unresolvable external symbol __vcrt_uninitialize_critical, referenced in function __scrt_dllmaain_uninitialize_critical
Msvcrt.lib (utility. obj): error LNK2019: Unresolvable external symbol __vcrt_thread.attach, referenced in function __scrt_dllmaain_crt_thread.attach
Msvcrt.lib (utility. obj): error LNK2019: Unresolvable external symbol __vcrt_thread_detach, referenced in function __scrt_dllmaain_crt_thread.attach
Msvcrt. lib (utility. obj): error LNK2019: Unresolvable external symbol _is_c_terminal_complete, referenced in function __scrt_dllmain_uninitialize_c
Msvcrt. lib (utility. obj): error LNK2019: Unresolvable external symbol __acrt_initialize, referenced in function __scrt_initialize _crt
Msvcrt. lib (utility. obj): error LNK2019: Unresolvable external symbol __acrt_uninitialize, referenced in function __scrt_uninitiation_crt
Msvcrt. lib (utility. obj): error LNK2019: Unresolvable external symbol __acrt_uninitiation_critical, referenced in function __scrt_dllmain_uninitiation_critical
Msvcrt. lib (utility. obj): error LNK2019: Unresolvable external symbol __acrt_thread.attach, referenced in function __scrt_dllmaain_crt_thread.attach
Msvcrt. lib (utility. obj): error LNK2019: Unresolvable external symbol __acrt_thread_detach, referenced in function __scrt_dllmaain_crt_thread_detach
ExplicitU.dll: fatal error LNK1120: 11 unresolved external commands
Abaqus Error: Problem during linking - Single Precision Abaqus/Explicit User Subroutines.
This error may be due to a mismatch in the Abaqus user subroutine arguments.
These arguments sometimes change from release to release, so user subroutines
used with a previous release of Abaqus may need to be adjusted.
The Abaqus Make execution procedure exited with errors
I compiled using a basic umat.cpp and found no issues, which left me very confused. Is this a problem with Python?

[jccrone]

Unfortunately I am not familiar with running Abaqus on Windows or general c++ code compilation with Microsoft VS. What is in your local abaqus_v6.env file for 'compile_cpp' and 'link_sl'?

[imyxc]

There should be no error in the configuration of 'compilale_cpp' and 'link_stl'. I followed the instructions to add the Python. h file directory and numpy directory. When compiling pyVUMAT.cpp, including<Python. h>, there was no error prompt,
I have some questions about this. If I add the directory where Abaqus installed Python. h and Numpy, where should I install PyTorch? Is it installed directly into the system environment? Or install it in the Python directory under the abaqus directory?

[jccrone]

The linking issue you are seeing would not be related to the PyTorch install (or any python package besides Numpy). I would like to see what commands are being called to compile and link the vumat. Can you provide 'compilale_cpp' and 'link_stl' or the output from Abaqus showing the commands for these steps?

To answer your question, which will be relevant after you get the vumat compiled:

I have been successful in creating a separate Python environment using conda and installing PyTorch there. This eliminates the need to install PyTorch in the Abaqus directory. You should make sure the version of Python is close to the version in the Abaqus build. For example, my Abaqus install uses Python3.10.5, so when I created my conda environment I specified 'python=3.10'. The actual version installed was 3.10.14, but that has not seemed to cause any issues.

Once you have your PyTorch install, you will want to ensure Python can find that path, as well as the path to the PyVUMAT modules. I do that by:

export PYTHONPATH=${PYVUMAT_DIR}:${HOME}/.conda/envs/pytorch3.10/lib/python3.10/site-packages:${PYTHONPATH}

where PYVUMAT_DIR is the top-level PyVUMAT directory, which should contain pyvumat/driver.py and
I've installed PyTorch in a conda environment called "pytorch3.10" in the directory '~/.conda/envs'. You should change the line based on your install directory and environment variable.

[imyxc]

I'm very sorry, my Python version is incorrect, but I found that my Abauqs2022 has a built-in Python 3.7 folder. Does this mean that even Abaqus 2022 can use this program?

[imyxc]

[jccrone]

I am unable to view the png. Is it possible to copy the text into the comments?

[imyxc]

Computer /usr/SIMULIA/Est...ucts/2022 /linux_a64 /tools / sMApy / python3.7；
In my abaqus installation path, there are both Python 2.7 and Python 3.7, both of which have Python. h header files. Does this mean that I can call pyVUMAT

[jccrone]

I had tried previously to use Python3 with older versions of Abaqus, but was unsuccessful. Despite that Python3 directory, my experience is that Abaqus still uses Python2 at runtime. I was unable to figure out how to force older Abaqus versions to use Python3 and the Abaqus support staff said Python3 is only available in the 2024 version. If you are going to use older versions of Abaqus, I would stick to Python packages that are compatible with Python2.

[imyxc]

As you said, if I use Python 2 and PyTorch only supports Python on its own Does version 3.5 or above mean that I cannot use pyVUMAT on Abaqus 2022?

[jccrone]

I'm not sure what you are asking, but Abaqus 2022 runs Python2 and therefore any PyVUMAT model running on Abaqus 2022 must use Python2.